The ornamental design for a cap for aerosol can, as shown and described.
FIG. 1 is an elevational front view of a cap for aerosol can; and,
FIG. 2 is a perspective view of a cap for aerosol can.
The side opposite that shown in FIG. 2 is a mirror image thereof. The rear
and interior portions of the cap for aerosol can that are not shown in
FIGS. 1 and 2 form no part of the claimed design.